Finally got together with a friend early this afternoon to rout a groove in a 2x6. The idea is to press a 1" pipe down onto the flat that will be held centered with some nails both sides or whatever. Next step is to visit another friend with an hydraulic press and force the pipe down over the flat into the basic shape needed for the heat shield.
Additional final fitting probably will be required plus the rear of the shield end will need the rounded edge.
Not sure when I'll get to the next step of using the press but will get back with results sometime soon. If the second one turns out as good as expected the third, and slightly longer flat will be shaped at the same time.
Dick